Down-draft deflector for gas fired furnaces and heaters



March 29, 1960 J, R ET AL DOWN-DRAFT DEFLECTOR FOR GAS FIRED FURNACES AND HEATERS Filed Dec. 23, 1958 INVENTORS ATT 2,930,374 DOWN-DRAFT DEFLECTOR non GAS FIRED FURNACES AND HEATERS iuea'a'ai 3. Lord andNorman A. McCarthy, Hamilton Ontario, Canada Applicatidn necemberzs, 1958, Serial No. 782,464 3 Claims. (Cl. 126- 307) I invention "relates to a down draft deflector for gas fired furnaces. H v

o It is an object of the present invention to provide a down draft deflector adapted to be incorporated in the smoke pipe or flue for a furnace that is installed horizontally andin which a mid-section has an opening facing downwardly and across which there is mounted a double deflector so that the hot exhaust gases or prod nets of combustion from the furnace are deflected mainly to the sides of the smoke pipe while any down draftair hazardous to the heating system is deflected downwardly through the bottom opening of the pipe section without interfering with the passage of the exhaust gases from the, furnace. I Qth'er objects of the invention are to provide a down draft deflector for gas fired furnaces, which is of simple construction, has a minimum number of parts, easy to assemble and inexpensive to manufacture, compact, easy is install upon the furnace, and effective and eflicient in use.

For a better understanding of the invention reference may be had to the following detailed description taken in connection with the accompanying drawing, in which:

Figure l is a side elevational view of the down draft deflector embodying the features of the present invention and with portions broken away to show the interior construction thereof. 7

Figure 2 is a bottom plan view of the deflector, looking upwardly through the down draft opening.

Figure 3 is an end elevational view looking from the furnace head of the deflector.

Figure 4 is an end elevational view looking into the opposite end of the deflector and toward the furnace.

Figure 5 is a plan view of the down draft deflector before being installed in the chimney plate, and

Figure 6 is a side elevational view of the down draft deflector.

Referring now to the figures, 10 represents generally the T section of a chimney pipe with a deflector r2 mounted therein. This pipe has a substantially horizontal section 12 with a crimped chimney end 13 and a vertical pipe portion 14 depending therefrom providing an elongated and curvingly terminated opening 15. The down draft deflector 11 lies within the horizontal pipe 12 above the opening or mouth 15 of the depending pipe portion 14.

The down draft deflector 11 is formed as a separate but fixed unit and installed in the horizontal pipe section 12. This deflector 11 comprises a plate 16 that is elongated and has a series of holes, the number depending on structural proportions,'here shown as three. The plate 16 with its holes 17 is centrally disposed in the horizontal section 12 in a diagonal manner so that its mounting tabs 18 are connected to the upper portion of the pipe section 12 by being slightly bent so as to lie parallel therewith and at its lower end by being slightly more bent, that is, the tab at that end, to lie parallel to the depending pipe section 14.

. Running below theholes 17 in the plate 16 is a metal 7 strip 19 that is parallel therewith and downwardly spaced indicate the flow of, the hot exhaust gases from the gas fired furnace. These gasespass. partially through the holes 17 in the platell, and on striking the metal strip 39 are deflected outwardly to pass along the sides of the pipe section 12. The Width. of the plate 16 is less than the diameter of the. pipe section 12 so that not only can someof the gases pass through the holes 17 but they will also pass through side spaces 17'. The gases passing through the opening 17 strike the metal strip 19 and are deflected outwardly and pass around the sides of the metal strip 19 to join with the gases passing through the spaces 17 Possible down draft is indicated bythe tailed arrows. usually created by abnormal atmospheric conditions above the chimney and opposes the successful function of the conventional pilot light, on entering the section 12 from the crimped or chimney end thereof strikes the underface of the metal strip 19, whichhas a width a little less than the plate 16, and is deflected downwardly through the down pipe draft section Hand its opening 15 into space. The down draft thus enters the exhaust end of the pipe section 12, strikes the deflector 11 and is turned down into thevertical pipe section 14 and outw'ardly through the opening 15.,

In the foregoing description, while the smoke pipe or flue has been described as horizontal or substantially horizontal it will be understood that all such piping has at least a gentle rise in its run from furnace to chimney,

although it may appear to the casual eye as close to horizontal.

Horizontal, therefore, is. taken to mean the run of the flue as opposed to any vertical portion thereof.

While various changes may be made in the detail construction, it shall be understood that such changes shall be within the spirit and scope of the present invention as defined by the appended claims.

What is claimed is:

l. A down draft deflector pipe for gas fired furnaces comprising a member in the form of a T having a substantially horizontal pipe section provided with openings at its ends for connecting with a chimney and with a furnace, respectively, and a depending substantially vertical down draft pipe section leading from the horizontal pipe section downwardly and opening, and a down draft deflector unit extending diagonally downwardly of said horizontal pipe section from top to bottom, said down draft deflector unit having one end connected to the upper portion of the horizontal pipe section and its other end connected to the portion of the down draft pipe section adjacent to the junction of the down draft pipe section with the horizontal pipe section whereby said down draft deflector unit overlies the portion of the T above the down draft pipe section, said down draft,

deflector unit having a pair of plates spaced apart in substantially parallel relationship with respect to each other to provide an upper plate and a lower plate, both a of said plates having a width less than the diameter of the horizontal pipe section to provide spaces at each side of the down draft deflector unit through'which exhaust gases may pass from the furnace end portion of said horizontal pipe section toward the chimney end portion of said horizontal pipe section.

2. A down draft deflector pipe for gas fired furnaceS This occasional down draft which is comprising a member in the form of a T having a substantially horizontal pipe section provided with openings at its ends for connecting with a chimney and with a furnace, respectively, and a depending substantially vertical down draft pipe section leading from the horizontal pipe section downwardly and opening into space, and a down draft deflector unit extending diagonally downwardly of said horizontal pipe section from top to bottom, said down draft deflector unit having a pair of plates spaced apart in substantially parallel relationship with respect to each other to provide an upper plate and a lower plate, both of said plates having a width less than the diameter of the horizontal pipe section to provide spaces at each side of the down draft deflector unit through which exhaust gases may pass from the furnace end portion of said horizontal pipe section toward the chimney end portion of said horizontal pipe section, the upper plate portion of said down draft deflector unit having a series of openings formed therein through which exhaust gases from the furnace flow from the furnace end portion of said horizontal pine section toward the lower plate of said down draft deflector unit to thereby be deflected laterally outwardly therefrom toward the sides of the horizontal pipe section, and the lower plate being arranged to deflect back drafts from the chimney end portion of the horizontal pipe section downwardly toward the down draft pipe section.

3. A down draft deflector pipe for gas fired furnaces comprising a member in the form of a T having a substantially horizontal pipe section provided with openings at its ends for connecting with a chimney and with a furnace, respectively, and a depending substantially vertical down draft pipe section leading from the horizontal pipe section downwardly and opening into space, and a down draft deflector unit extending diagonally downwardly of said horizontal pipe section from top to bottom, said down draft deflector unit having one end connected to the upper portion of the horizontal pipe section adjacent to the chimney end portion thereof and its other end connected to the portion of the down draft pipe section adjacent to the junction of the down draft pipe section with the horizontal pipe section whereby said down draft deflector unit overlies the portion of the T above the whole of the down draft pipe section, said down draft deflector unit having a pair of plates spaced apart in substantially parallel relationship with respect to each other to provide an upper plate and a lower plate, both of said plates having a width less than the diameter of the horizontal pipe section to provide spaces at each side of the down draft deflector unit through which exhaust gases may pass, the upper plate portion of said down draft deflector unit having a series of openings formed therein through which exhaust gases from the furnace flow from the furnace end portion of said horizontal pipe section toward the lower plate of said down draft deflector unit to thereby be deflected laterally outwardly therefrom toward the sides of the horizontal pipe section, and the lower plate being arranged to deflect back draft of gases from the chimney end portion of the horizontal pipe section downwardly toward the down draft pipe section.

References Cited in the file of this patent UNITED STATES PATENTS 878,474 Waterbury et a1. Feb. 4, 1908 1,891,600 Lancaster Dec. 20, 1932 2,353,179 Morris July 11, 1944 2,359,465 Coburn et al. Oct. 3, 1944 2,482,577 Dahlstrorn Sept. 20, 1949 2,695,016 Miller et al Nov. 23, 1954 

